Ritual Battles Re-Shape Physiology in 1 Ant Species (image) North Carolina State University Share Print E-Mail Caption The ritualized fighting behavior of the ant species Harpegnathos saltator is linked to increases in dopamine levels that trigger dramatic physical changes in the ants without affecting their DNA. Credit Clint Penick Usage Restrictions Photo credit must be given. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.